Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 19-09-2023 and time 08:55:26 (UTC) in region 1 km S Ricaldone (AL)

A magnitude ML 2.0 earthquake occured in region: 1 km S Ricaldone (AL), on

  • 19-09-2023 08:55:26 (UTC)
  • 19-09-2023 10:55:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.7210, 8.4720 at 44 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Ricaldone AL 1 684 684
Alice Bel Colle AL 2 766 1450
Quaranti AT 4 183 1633
Castel Rocchero AT 4 395 2028
Maranzana AT 4 277 2305
Castelletto Molina AT 5 180 2485
Strevi AL 5 2019 4504
Acqui Terme AL 5 19896 24400
Fontanile AT 5 567 24967
Cassine AL 5 2961 27928
Mombaruzzo AT 6 1117 29045
Rivalta Bormida AL 6 1446 30491
Castelnuovo Bormida AL 7 694 31185
Montabone AT 7 333 31518
Terzo AL 7 923 32441
Visone AL 7 1194 33635
Castel Boglione AT 7 609 34244
Orsara Bormida AL 8 424 34668
Bruno AT 8 321 34989
Morsasco AL 9 679 35668
Melazzo AL 9 1325 36993
Cavatore AL 10 291 37284
Rocchetta Palafea AT 10 338 37622
Montaldo Bormida AL 10 664 38286
Castelnuovo Belbo AT 10 895 39181
Grognardo AL 10 259 39440
Bistagno AL 10 1887 41327
Calamandrana AT 11 1761 43088
Prasco AL 11 521 43609
Nizza Monferrato AT 11 10429 54038
Sezzadio AL 11 1246 55284
Trisobbio AL 11 655 55939
Gamalero AL 11 844 56783
Carpeneto AL 12 977 57760
Bergamasco AL 12 744 58504
Sessame AT 12 271 58775
Incisa Scapaccino AT 12 2288 61063
Carentino AL 12 340 61403
Castelletto d'Erro AL 12 148 61551
Frascaro AL 13 440 61991
Castelspina AL 13 416 62407
Cremolino AL 13 1086 63493
Morbello AL 13 402 63895
Ponti AL 13 606 64501
Vaglio Serra AT 13 275 64776
Cassinasco AT 14 611 65387
Borgoratto Alessandrino AL 14 584 65971
Monastero Bormida AT 14 931 66902
San Marzano Oliveto AT 14 1047 67949
Canelli AT 14 10485 78434
Cortiglione AT 15 571 79005
Cassinelle AL 15 914 79919
Ponzone AL 15 1051 80970
Cartosio AL 15 747 81717
Rocca Grimalda AL 15 1512 83229
Molare AL 15 2181 85410
Predosa AL 15 2048 87458
Bubbio AT 15 893 88351
Vinchio AT 16 601 88952
Oviglio AL 16 1265 90217
Montechiaro d'Acqui AL 16 560 90777
Moasca AT 16 494 91271
Silvano d'Orba AL 16 1988 93259
Castellazzo Bormida AL 16 4570 97829
Belveglio AT 17 350 98179
Castelnuovo Calcea AT 17 759 98938
Ovada AL 17 11477 110415
Denice AL 17 176 110591
Capriata d'Orba AL 17 1904 112495
Masio AL 17 1420 113915
Casal Cermelli AL 18 1234 115149
Mombercelli AT 18 2259 117408
Loazzolo AT 18 359 117767
Tagliolo Monferrato AL 18 1581 119348
Fresonara AL 18 731 120079
Malvicino AL 18 85 120164
Rocchetta Tanaro AT 18 1450 121614
Belforte Monferrato AL 19 515 122129
Castelletto d'Orba AL 19 2047 124176
Agliano Terme AT 19 1642 125818
Santo Stefano Belbo CN 19 3984 129802
Cerro Tanaro AT 19 626 130428
Basaluzzo AL 19 2087 132515
Calosso AT 19 1279 133794
Cessole AT 20 403 134197
Bosco Marengo AL 20 2457 136654
Felizzano AL 20 2344 138998

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SW of Alessandria (93943 inhabitants)
29 Km SE of Asti (76202 inhabitants)
46 Km N of Savona (61345 inhabitants)
50 Km NW of Genova (586655 inhabitants)
69 Km E of Moncalieri (57294 inhabitants)
73 Km SW of Vigevano (63310 inhabitants)
74 Km SE of Torino (890529 inhabitants)
75 Km SW of Pavia (72576 inhabitants)
81 Km E of Cuneo (56081 inhabitants)
82 Km S of Novara (104380 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 2.0 2023-09-19
08:55:26		 44.7212 8.472 44 2023-09-19
09:04:43		 Sala Sismica INGV-Roma 121226971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-19 08:55:26 ± 0.16
Latitude 44.7212 ± 0.0090
Longitude 8.4720 ± 0.0177
Depth (km) 44 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121226971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1380
Semi-minor axis of confidence ellipse (meter) 289
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 272
Circular confidence region, given by single value of horizontal uncertainty (meter) 1380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 146
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.22937
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 18
Magnitude information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 9
Type of magnitude ML
Reference to an origin 121226971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-19 09:04:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CING.HHZ. 2023-09-19T08:57:26.35 3.0 undecidable manual Sg 23.469999 0
IV.NRCA.HNZ. 2023-09-19T08:57:23.85 3.0 undecidable manual Sg 16.450001 0
IV.ATVO.HHZ. 2023-09-19T08:57:11.00 3.0 undecidable manual Sg 21.040001 0
IV.ARRO.EHZ. 2023-09-19T08:57:05.26 3.0 undecidable manual Sn -0.17 0
IV.ARVD.HHZ. 2023-09-19T08:56:55.90 3.0 undecidable manual Sn -1.68 0
SI.ABSI.HHZ. 2023-09-19T08:56:55.67 3.0 undecidable manual Sg 11.8 0
IV.MMUR.HNZ. 2023-09-19T08:56:31.20 3.0 undecidable manual Pg 12.82 0
IV.ATCC.EHZ. 2023-09-19T08:56:30.24 3.0 undecidable manual Pg 13.65 0
IV.FRON.EHZ. 2023-09-19T08:56:30.98 3.0 undecidable manual Pg 15.51 0
IV.MMO1.EHZ. 2023-09-19T08:56:30.22 3.0 undecidable manual Pn 5.69 0
IV.ROVR.HHZ. 2023-09-19T08:56:30.48 3.0 undecidable manual Sn 5.62 0
IV.NRCA.HHZ. 2023-09-19T08:56:28.32 3.0 undecidable manual Pn 5.23 0
GU.IMI.HHE. 2023-09-19T08:55:56.00 0.6 undecidable manual S 207 101.0211 97 0.14 45
GU.ENR.HHE. 2023-09-19T08:55:55.40 0.6 undecidable manual S 237 99.6225 97 -0.18 44
GU.RORO.HHE. 2023-09-19T08:55:50.46 0.6 undecidable manual S 206 74.7696 102 0.18 47
GU.GBOS.HHZ. 2023-09-19T08:55:50.27 0.6 undecidable manual S 223 73.0713 102 0.36 46
GU.SATI.HHZ. 2023-09-19T08:55:48.32 0.3 undecidable manual P 340 136.4634 94 0.36 58
GU.CANO.HHZ. 2023-09-19T08:55:47.38 0.6 undecidable manual S 198 59.8956 108 0.2 49
GU.CIRO.HHZ. 2023-09-19T08:55:45.34 0.6 undecidable manual P 324 120.5904 95 -0.66 39
IT.GNV.HGE. 2023-09-19T08:55:45.53 0.6 undecidable manual S 131 48.5181 116 0.63 44
GU.RNCA.HHZ. 2023-09-19T08:55:45.07 0.6 undecidable manual S 126 46.9197 118 0.47 46
GU.STV.HHE. 2023-09-19T08:55:44.76 0.3 undecidable manual P 240 104.9172 96 0.7 57
GU.RSP.HHE. 2023-09-19T08:55:44.57 0.3 undecidable manual P 297 106.0161 96 0.38 62
GU.IMI.HHE. 2023-09-19T08:55:43.30 0.3 undecidable manual P 207 101.0211 97 -0.27 65
GU.TRAV.HHZ. 2023-09-19T08:55:43.58 0.6 undecidable manual P 327 104.5176 96 -0.43 43
GU.MGRO.HHZ. 2023-09-19T08:55:42.46 0.3 undecidable manual P 215 91.8414 98 0.02 70
GU.ENR.HHE. 2023-09-19T08:55:42.80 0.3 undecidable manual P 237 99.6225 97 -0.61 60
GU.BHB.HHZ. 2023-09-19T08:55:41.30 0.3 undecidable manual P 278 96.0261 97 -1.66 36
GU.RORO.HHE. 2023-09-19T08:55:40.39 0.3 undecidable manual P 206 74.7696 102 0.05 72
GU.ROTM.HHZ. 2023-09-19T08:55:40.52 0.6 undecidable manual S 326 17.0718 153 0.48 49
GU.GBOS.HHZ. 2023-09-19T08:55:40.01 0.1 undecidable manual P 223 73.0713 102 -0.12 94
GU.PCP.HHZ. 2023-09-19T08:55:39.99 0.6 undecidable manual S 164 20.7681 148 -0.44 47
GU.CANO.HHZ. 2023-09-19T08:55:38.71 0.1 undecidable manual P 198 59.8956 108 0.15 97
IV.MONC.HHZ. 2023-09-19T08:55:38.86 0.3 undecidable manual P 313 57.9975 109 0.53 65
IT.GNV.HGE. 2023-09-19T08:55:37.17 0.3 undecidable manual P 131 48.5181 116 -0.07 75
4P.IT06A.HHZ. 2023-09-19T08:55:37.87 0.3 undecidable manual P 246 51.0156 114 0.34 71
GU.RNCA.HHZ. 2023-09-19T08:55:36.95 0.1 positive manual P 126 46.9197 118 -0.12 100
GU.PCP.HHZ. 2023-09-19T08:55:34.12 0.3 undecidable manual P 164 20.7681 148 -0.54 70
GU.ROTM.HHZ. 2023-09-19T08:55:34.24 0.3 undecidable manual P 326 17.0718 153 -0.19 78
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CANO.HHE. ML:2.2 0.00022799999999999999 1.48 AML other m 2023-09-19T08:55:48.76
GU.CANO.HHN. ML:2.3 0.000307 0.24 AML other m 2023-09-19T08:55:49.12
IV.MONC.HHN. ML:1.9 0.00014105 1.26 AML other m 2023-09-19T08:55:51.75
IV.MONC.HHE. ML:1.9 0.000138 1.58 AML other m 2023-09-19T08:55:52.10
GU.PCP.HHN. ML:1.0 0.000028379812000000002 0.1344 AML other m 2023-09-19T08:55:41.33
GU.ROTM.HHN. ML:2.2 0.00051921345 0.1984 AML other m 2023-09-19T08:55:40.66
4P.IT06A.HHE. ML:2.0 0.00018796195 0.1792 AML other m 2023-09-19T08:55:46.72
4P.IT06A.HHN. ML:2.2 0.000251043 0.1792 AML other m 2023-09-19T08:55:47.49
GU.GBOS.HHE. ML:1.2 0.000020377005 0.16 AML other m 2023-09-19T08:55:52.02
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download